A lead screw hand wheel for the 7x14 lathe.

[modeldozer]

Hi all.

This is my version of a lead screw hand wheel for my 7x14 lathe.  It also incorporates ball bearings and moving the lead screw to the tailstock side for maximum travel.
The design.





Started with the RH bearing support.  Outer bearing location bored.



It was flipped over, the centre located and the inner bearing location bored.





As I do not yet have a rotary table, a makeshift setup was made to machine the radius on the end of the support.  It was a matter of taking it very slow and steady.





The finished support.





A reference line was made on the bearing support.





The dial ring was turned and marked with calibrations using my spindle indexer.





I then started to turn the hand wheel from a piece of 80mm round stock.  With only a 400W motor this was a very slow process and I had to leave things to cool down regularly.  Unfortunately I over did it and the motor lost most of it's power.  I could not find anything burned or shorted in either the motor or the control, but it just din not have any power.  A new 550W motor was ordered and the project was on hold till it arrived and could be fitted.  With all this going on I forgot do any photos of the process.
Here is the finished RH support and hand wheel assembly fitted to the lathe.



The RH extension mounted on the lead screw.



Machining the LH bearing support.





Cutting circlip grooves in the LH lead screw extension.



The completed LH support and extension.





Made an adaptor ring for the lead screw guard tube.





Everything fitted to the lathe.







The knurling tool that I had ordered arrived and I could knurl the one side of the dial.





Final assembly.







Used the lathe with the hand wheel and it makes life a lot easier.

Cheers
Abraham

[vtsteam]

Very Nice!! 

[S. Heslop]

Very swish. My 'stuff to do when I finally get a mill' list is getting bigger.

[Dag-50]

Allego alcune immagini di un indexer che ho realizzato anni fa per incidere i volantini

[Stilldrillin]

VERY nicely done Abraham!   

A leadscrew handwheel tranforms the feel and sensitivity..... 

David D

[modeldozer]

vtsteam,S.Heslop,David D,
                                          Thanks for the comments.

Dag-50, sorry but I do not speak Italian but I think you are looking for info on the indexer, if so see http://madmodder.net/index.php/topic,8374.0.html

Cheers
Abraham

[rotorhead]

Abraham,

Your innovations and workmanship are excellent, I like to modify my machines, because they are the basis of what you want for yourself.

Dag-50, that all-in-one micrometer dial indexing scriber is also very innovative, you are a person with a like mind.

[BillTodd]

Nice job :-)


400 watts is more than enough power to turn an 80mm bar. What those little lathes lack is torque. Perhaps your next mod should be some kind of reduction gearing.


Bill

[Meldonmech]

 
  I fitted a lead screw handle to my Chester DB8 VS, the only problem is it moves the saddle towards the headstock when turning anti clock wise, which takes a while to get used to.

                                       Well done   Cheers David

[andyf]

I think 7x minilathe leadscrews also work counter-intuitively, David. Odd that your DB8 is the same; it comes from the same stable (Weiss in China) as my Warco WM180, which is its little brother. I have fitted a handwheel on the end of the leadscrew, but winding mine clockwise sends the saddle towards the headstock. Strange that on two lathes which are related, your leadscrew has an RH thread whereas mine is LH.

My leadscrew is 12tpi (0.0833" pitch), which made a dial difficult to graduate, so I put the dial on a layshaft driven by gearing such that one dial revolution = 100 thou. The dial turns anti-clockwise as the leadscrew turns clockwise. If you put your handwheel on a layshaft and geared it to the leadscrew, that would reverse matters. But you are probably used to it by now, just as I am used to my dial contra-rotating.

Andy

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